<<< If these 2 files show different content, it also indicates that the heatbeat block is being updated from other node beyond the server.

4. If heartbeat is detected while the affected diskgroup is not mounted, it indicates that the diskgroup in question is currently mounted by other node. But it does not tell which node is currently mounting it. Find the node with help of Storage Admin team which is currently mounting the diskgorup in question and dismount and try to mount it on the 2nd node.